Chuck.



A. I. JACOBS.

GHUCK.

APPLICATION FILED 11111.16, 190s.

Patented Jan. 26, 1909.

/A/VLNT'OP:

UNITED STATES PATENT OFFICE.

ARTHUR I. JACOBS, OF HARTFORD, CONNECTICUT, SSIGNOR TO THE JACOBS MANUFAC- TURING COMPANY, OF HARTFORD, CONNEGTICUT, A CORPORATION OF CONNECTICUT.

annex.

Specification of Letters Patent.

Patented Jan. 26, i999.

T0 all whom fit may concern:

citizen of the United States, residi at Hartford, in the county of Hartford anv State of Connecticut, have invented a new and useful Chuck, of which the following is a specification.

This invention relates to a chuck which is designed to be ap lied to a sensitive drill press, high speed drill press, lathe, electric drill, breast drill and similar drilling, tapping and boring machines, for holding a drill, tap, oit or the like tool, of the class 1n which the 'aws are moved in inclined recesses in the ody by means of an exterior nut or sleeve for the purpose of gripping and releasing the shank of the tool.

The object of the* invention is to produce a simple, and cheap article of this nature which is easily and quickly manipulated so as te very tightlyygrip or release the tool shank.

Figure 1 of the accompanying drawings shows a side elevation of a chuck which embodiesthe invention. Fig. 2 is a view looking at the jaw end of the chuck. Fig. 3 is a longitudinal section of the chuck and Fig. 4 is a side view of the body of the chuck.

The body 1 of the chuck has in one end a socket 2 for receiving the stem of the machine spindle, which socket is preferably tapered as shown, but which may b'e straight if desired. In the other end the body has a socket 3 for receiving the shank of the tool. If desired, these sockets may communicate so aste provide an opening entirely through the center of the body. The body also has inclined awsockets4 of which there may be any desired number. In the chuck shown there are three of these jaw sockets for receiving the three jaws 5, each of which has a section of screw thread 6 formed on its outer side nearone end and has its op osite side near the other. end shaped, prefera ly by milling it off to an edge, so that the aws may grip the shank of a small tool.

The body of the chuck shown has an annular recess in which is placed a ring 7 that` has its inner wall shaped to correspond with the tapering bottom wall of the recess and to fit over the jaws without interfering with their movement. The forward and outer edge of the ring is preferably curved so as to form a ball race. Placed in the annulrnrecess in the 'body in front of the ring is a sectional nut 8 the rear edge o f which bears Vagainst the balls 9 which are located inthe annular recess between the ring and the nut. The interior wall of the nut is provided with screw threads 'designed to `iit ,the sectional threads formed on the outer vedges of the aws. J Uponlthe outside of the body and thieunut is a sleeve 10. This sleeve issecured ,to ,the nut by being driven thereon or otherwise fastened thereto so that the nut and the sleeve will turn together, and while the sleeve closely tits the exterior of the body, it is not fastened thereto. Therouter surface of this sleeve may be knurled, milled or otherwise roughened for the purpose of providing a grip or an ornamentation.

When the sleeve and consequently the nut which is fastened to it are turned 1n one direction with relation to the body the threads inthe interior of the nut engaging the seetional threads on the backs of the jaws, move the jaws forwardly and cause a contraction of the space between them. When the sleeve and nut are turned the other way the jaws are drawn backwardly and consequently the space between them is expanded. The nut is held against movement 1n one direction by the frontend wall of the annular recess in the body, and from movement in the other direction by the balls between the nut and the ring. When the jaws are being drawn in and the space between them increased for releasing the shank of a tool, the nut thrusts against the front wall of the annular recess, but when the nut is turned so as to force the jaws'outwardly for causing them to grip the shank of the tool the thrust of the nut is against the balls.

This construction is very simple to manufacture and easy to assemble, and as a result of the employment of the balls in this way!r the friction incident to the backward thrust of the nut is so reduced that the jaws can be forced very quickl r and ver powerfully against the shank of) the drill, tlirus rendering unnecessary the employment of any tool for turning the sleeve or nut, However, an ordinary s anner or other tool can be employed if esired for turning the sleeve or nut.

It is to be understood that rolls may be used instead of balls and that when balls l are mentioned it is intended to inrlnde rolls i as the equivalent of balls.

The invention claimed is:

1. A chuck having a body with an annular recess and inclined sockets, a nut rotarily mounted in said annular recess, a ring` lo @ated in said annular recess, balls arranged between the nul and the ring, and jaws` movable in the inclined sockets :1nd having l threads engaged with the threads of the nut, substantially as specified.

2. A chuck having n. body with an annular recess and inelined sockets, a nut rotarilyr mounted in said recess and held against longitnrhnal nloveinent in one direction b v the body of the ehuclc, a ringr `located in said recess, balls arranged between the nut and the ring to prevent the nnt l'roin moving longitudinally in the opposite direction, a sleeve extending over the recess encircling the body l and attached to the nut, and jaws movable i in the sockets and having threads-en aged with threads of the nut, substantialy as speeiiied.

3. A ehuek having a body with an annular reeess and inclined sockets that open throu h one end ol' the body and else open into te recess, a nut rotarily mounted in the front part of said annular recess and having interior threads, a ring located in the rear part of the sind annular recess, said rlng being larranged to cover openings from the 1nelined sockets into the annular recess, balls arranged around the ring between the nut und the ring and jaws movable in the inclined sockets and having threads engaged by the threads of the nut, substantially as specified. V

g ARTHUR I. JACOBS.

-llvitnessesz I JosnrnlNE M. Srnmirrnn, HARRY 1i. \"\"'1LL1AMs 

